Hi Grizzly,
Let me welcome you in advance to the Alberta Foothills just south of Calgary. May/June can be cool so be sure to bring a jacket. There will still be lots of snow in the higher elevations and many lakes will still be frozen! The landscape is breath-taking and dramatic. Bears will just be waking up in June and late May. Early to mid June is snow-pack melt time and high stream flow advisories. Highways through the mountains are usually very clear and good. Be aware however that weather changes rapidly. It is possible that there will still be snow on the road side and in high elevations on the road... Just drive appropriately.

It is 1100kms from Calgary to Vancouver. I would allow a few days to travel, stop and explore. Be aware, if this is your first visit to Canada, distances are vast compared to the UK and Europe in general. All of the UK fits in Alberta.

Personally, I would forgo the cruise and explore Vancouver Island. Tofino is very popular, but it's wild Pacific coast... For me, a very special part of the world and well worth the visit and time. Just driving there is an adventure! Vancouver Island is a treasure trove of lots of coves, fishing, and wilderness.

Be sure to visit the museum of natural history in Victoria. Our Steve knows it very well.

Back to Alberta, Calgary is a very modern city with a western history and a some very fine museums, parks and eateries. The world-reknown Royal Tirell Dinosaur Museum east of Calgary is not to be missed, and south of my town the "Head-Smashed in Buffalo Jump is also a fine Blackfoot First Nations interpretive site. You would drive right by my town, so PM me if you like to stop for a coffee...

Grizzly, you will have a wonderful time here. We are a polite friendly lot here in Alberta.

Let me know how your plans are coming.